Tube.



No. 674,394. 7 Pat ented May 2|, I901.

A. E. BECK &.-G. TOWNSEND.

TUBE.

(Application filed Nov. 2, 1900.) (No Model.)

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. To all whom it may concern.-

UNITED STATES ARTHUR EDWARD BECK AND GEORGE TOWNSEND, OF BIRMINGHAM,

PATENT OFFICE.

ENGLAND, ASSIGNORS TO PERKINS, LIMITED, OF VVARRINGTON, ENG- LAND.

TUBE.

SPECIFICATION formingpart Of Letters Patent No. 674,394, dated May 21, 1901.

Application filed November 2,1900. Serial No 35.217. (No model.)

Be it known that we, ARTHUR EDWARD BECK and GEORGE TOWNSEND, subjects of the Queen of Great Britain and Ireland, and residents of 33 Newhall street, in the city of Birmingham, England, have invented certain new and useful Improvements Relating to Boiler and other Metal Tubes, (for which we have filed an application for a patent in Great Britain, No. 11,981, bearing date July 3, 1900,) of which the following is a specification.

This invention consists of improvements relating to boiler and other metal tubes, our object being to readily and economically produce such tubes from an effective combination of steel and copper or other metals, so that while having ample strength to withstand the stresses imposed upon them they will be better able to resist corrosion than the ordinary tubes at present in use.

On the accompanying sheet of drawings explanatory of our invention, to be hereinafter referred to, Figure 1 is a sectional elevation showing a short thick iron or steel tube or shell in readiness for passing through the rolls, with the mandrel upon which it is to be reduced in thickness and correspondingly lengthened by the rolls and a copper lining,

for the tube fitting loosely upon the said inandrel. Fig. 2 represents the same parts as Fig. 1, but with the tube in the act of passing through the rolls. Fig. 3 is a sectional view of the finished tube having the copper lining fused thereto.

The same reference-letters are employed in the three views to indicate the same parts.

In the application of our invention to the manufacture of tubes for a water-tube or tubulous boiler in which the water passes through the tubes we place over the mandrel, as A, upon which the hot steel or iron tube shell or comparatively short and thick tube, as B, is to be reduced in thickness and correspondingly lengthened, a cold thin shell or loose sheathing of copper, as 0, preferably of a length equal to that of the steel or iron shell B. We then stretch or elongate together both the iron or the steel shell and the copper shell, preferably by subjecting them 5 a (while supported by the mandrel A) to the action of rolls D and E in the manner illustrated at Fig. 2. As the parts pass between the rolls the two metals (namely, the iron or steel forming the tube-shell B and the copper 0) are pressed into close contact, and as the heat of B is sufficient to-fuse the surface of O in contact with it the two metals become very effectually united.

By our process of combining and fusing the copper with the main tube during the ordinary course of its manufacture we are readily enabled to produce at small cost compound tubes with the desired thickness of the respective metals to suit the particular services for which they are required.

We apply our invention to the manufac ture of tubes having a copper or other noncorrodible interior, a wrought-iron exterior;

and with steel interposed between the two, nesting the three hollow tube blooms or shells the one within the other in the order indicated. We may also make iron or steel tubes or iron and steel tubes witha copper or like exterior and tubes having a copper surface both inside and outside.

Having thus described our invention, what we claim as new, and desire to secure by Letters Patent, is

The process whereby in the course of the So manufacture of boiler and other tubes a covering of non-corrodible metal is fused to the said tubes, consisting in the nesting of a thick and hot tube-shell with a thin and cold sheathand in subsequently subjecting them together to a compressing, reducing, and elon gating action while supported internally by a mandrel, substantially as described.

In witness whereof we have hereunto set 0 ing of non-corrodible and more fusible metal, 

